William brown



diluted l# ita-tra @anni ken, in the county of Hudson and .State of NewJerv Valves and Valve- Gear for Steam-Engines; and I do pipe isconnected. These ports are the cut0ii` or regf 'WILLIAM RoWN, or

Letters Patent No. 102,3

o is o K n N, N'E'W J Annen Y.

67, dated April 26, v1870.

VARIABLE CUT-OFF VALVE-GEAR AND VALVE. I

The Schedule referred to in these Letters Patent anamaking part of thesame I arranged back to back', and hav To all whom yit 'may concern:

Be it known `that I, WILLIAM Bnowx, of Hobosey, have invented a new anduseful Improvement in hereby declare that the following is a full,clear, and exact description of the same, reference heilig had to theaccompanying drawings forming part of this specification.

This invention consistsy principally in a novel construction of theslide-valve or valves of a steam-engine, a novel construction of thevalve-seat, a novel arrangement of the steam-passages, and a novel modeof operating theA valve or valves, whereby a separate regulating-valvefor regulating the speed of the engine is dispensed with, and the samevalve or valves which eiectthe induction, and the educt-ion also, ifdesired, of the steam, serve also as a regulating-valve to regulate thespeed of the engine under the control of a governor.

rJhe invention is capable of some modifications, but I haverepresentedin the drawing an example .of its simplest form, in which the induction'and eduction of the steam and the regulation of the speed are effectedby a single valve. y

Figure l is a plan of the Ina-in shaft, the governor, the steam-chest,theA valve, and the valve-operating.; mechanism of a horizontal engine,the valvev and'v steam-chest being shown in section.

Figure 2 is a longitudinal vertical section 'of the steam-chest.

Figure 3 is a face view of the valve.

Figure 4 is a transverse section of the steam-chest and valve.

Figure 5 is an elevation of the governor and the mechanism connecting itwith the valve-stem, the' Astem being shown in transverse section.

Similar letters of reference indicate corresponding parts in the severalfigures.

A is the steam-chest, of cylindrical form, bored out truly from thevalve-seat, and having ports, a, a','and b, like those commonly providedfor what is known as the three-port slide-valve, the two ports (t acommunicating with the opposite ends of the steam-cylinder of theengine, and the intermediate portbcommunicating with the exhaust-pipe.It-is provided, also, with two opposite ports, c c', for the admissionof steam thereinto from a hollow belt, d, with which the steamulatingports, and their greatest length is parallel with the length of thesteam-chest and with the ordinary sliding movement ofthe valve, by whichthe induction and eduction ofthe steam to and from the cylinder areeffected.

ing their faces turned lto tit its seat in the cylindrical interiorof'the steamchest.

The face of the segment B, which constitutes thev `v .valve properforet'ecting the induction andcduction of the steam, is (except that itis cylindrical) like that of au ordinary three-port slide-valveand hasthose portions ofzits face at the side of the cavitya, cornmonly'provided for the eduction of the steam from the ports a a to that, 11,inl the steam-chest,'somewhat wider than usual, to. provide for it-saction hereinafter described on the ports c c.

The segment G has its face perfectly 'pla-in, every portion of itfitting to the cylindrical interior of the steam-chest. The portion m ofthe valve-stem E which is received within the valve, and to which thelatter isl secured by screw-nuts f g ou the said stem, is square in itstransverse section and taperor wedge-shaped longitudinally, andthisportion of they stem'is, by the adjustment of the saidv nuts, made toset out the two segments B C against the interior of the steam-chest,whereby they fit steam-tight therein, thus compensating for the wear ofthe valve and boreof the chest.

,The ports c c' 'are so arranged, one at the side of the ports a a b andthe other opposite Ato it, that the valve,` by a motion on its axis, ismade. to close or contract the opening of both of them, and thus cut oiordi minish the supply of steam from the passage in the hollow belt d tothe interior of the stean'1cl1est-, the

centric on the. said shaft for operating the valve to produce theinduction and eduction oi' the steamto and from the cylinder of theengine, the` said eccentric connecting vwith the valve-stem by a rod, H,and the operation of the valve produced hy it rbeing like that ot' anordinary three-port valve.

I is the governor, having its slide h connected by a lever, J,'aud rod,K, with a lever, L, which is arranged upon a square or featheredportion, i, of the valvestein, radially thereto, and which is also ittedinto a stationary iillcrum-post, M, in such manner as tol be capable ofoscillating, but notot moving in the dircc tion ofthe length ot' thevalve-stem.

lhe square portion i ofthe stem is capable of sliding through the saidlever L in the ordinary movement of the valve, before referred to asproduced by tliee'ccentric.

The rise and fall o variations inthe velocity' ot' thecngine, are madeto'so B C is the valve, madev in two pieces or segments,

act upon the lever L as to turn the valve in its seat in,

f the governor-slide, produced by.

the steam-chest, in one or the other direction, transvers to themovement by'which it effects the induction and eduction of the steam.

When the engine vis running steadily at its Anormal speed, the valve isturned to and held in such a position as to leave the side ports c c' asnear as may be necessary uncovered by the valve, but, as soon as anytendency to :Ln-increased velocity of the engine is developed, the riseof the governor-slide h raises the t lever L, and so turns the valve toa position' to close or contract the openings ofthe side ports cc, andthusv made by a sleeve, j, in which the said stem is capable of turningfreely, but to which it isconfined longitudinally by screw-nuts It k.

It will readily be understood by those conversant with steam-enginesthat the invention may be modied to adapt it to two short slide-valves,applied one to each of the cylinder-ports, either in the saine or inseparate steam-chests; also, that it may be modified to adapt it toslide-valves which are only inductionvalves in engines in which separateeduction-valves are used. i

The invention might also be adapted to dat valves, for which atransverse motion, corresponding with the oscillating motion of thevalve represented, is provided. Y It may also be adapted to any ordinaryvalve without a back-piece, l), in which case one port c only isrequired for the valve to produce its regulating action.

I do not claim'the dispensing with a separate valve for regulating thespeed of the engine; but

W'hat I claim as my invention, and desire to secure by Letters Patent,is-

l. The combination of the one or more side ports c c iu the valve-seat,and the valve having a longitudinal and an oscillating or transversemotion, substantially as and for the purpose herein described.

2. rIhe combination ofthe two segments B O of the valve with `the taperinterposed portionm of the valvestem, substantially as and for thepurpose herein described.

3. The combination ofthe loose sleeve-connection j ofthe eccentric withthe valve-stem and the lever L, connecting the said stem, by thesqnareor feathered portion i, withthe governor,substantially as and for thepurpose hcrein specified. i

' WILLIAM BROWN.

Witnesses:

FRED. HAYNns, M. J. SHANLY.

